JP2021123026A - Strand and modeling - Google Patents

Abstract

To provide a strand that enables three-dimensional printers to easily form objects with excellent impact strength, and objects with excellent impact strength.SOLUTION: The strand of the present invention is a strand used as a molding raw material for a three-dimensional printer, and has a base material made mainly of thermoplastic resin, one or more fibers or fiber bundles impregnated in the base material and extending in the axial direction, and twisted along the above axial direction.SELECTED DRAWING: Figure 1

Description

The present invention relates to strands and shaped objects.

As an apparatus for molding an object having a three-dimensional shape, a 3D (three-dimensional) printer that employs a heat-melting lamination method in which resins in a thermoplastic state by heat are stacked one by one is known. This 3D printer can form a three-dimensional shape without the need for a mold, a jig, or the like. In addition, it is possible to form a three-dimensional object that is difficult to form by conventional injection molding technology.

As a modeling technique using such a 3D printer, for example, a first continuous material containing resin and a second continuous material containing fibers such as carbon fibers are used separately, and these are supplied from a head to be reinforced by fibers. A technique for forming a molded product (modeled product) has been proposed (International Publication No. 2015/182675).

International Publication No. 2015/182675

Since the technique of Patent Document 1 needs to supply two kinds of continuous materials, it cannot be said that the modeling is simple.

On the other hand, as the use of 3D printers expands widely, there is a possibility that a three-dimensional structure (modeled object) is required to have further mechanical strength.

The present invention has been made in view of such circumstances, and provides a strand capable of easily modeling a modeled object having excellent impact strength with a 3D printer, and a modeled object having excellent impact strength. Is the subject.

As a result of diligent research by the present inventors to solve the above problems, the following findings were obtained.
That is, the present inventors put continuous fibers formed of an inorganic material such as carbon fiber into a molten state instead of the first continuous material and the second continuous material of Patent Document 1 as a modeling raw material suitable for a 3D printer. I thought about impregnating a certain thermoplastic resin. However, it has been found that the impregnated material obtained by this impregnation is rigid and easily buckled, so that it is easily bent at the time of winding and difficult to wind, and it is difficult to say that it is excellent in handleability.
As a result of further diligent research by the present inventors based on the above findings, by impregnating the molten thermoplastic resin with fibers or twisting the resin while impregnating the fibers, the obtained strands are less likely to buckle and become easier to handle. Found to be excellent. Moreover, especially when a plurality of fibers and fiber bundles are used, in the obtained strand, the thermoplastic resin component is distributed more on the surface side than on the center side of the strand by twisting after impregnation, and the fiber breaks and breaks. Was suppressed, and the friction between the fibers was found to increase. Then, when modeling is performed using this strand with a heat-melting lamination type 3D printer, the impact strength of the modeled object is increased due to contributions such as distribution of the thermoplastic resin component, suppression of fiber breakage, and increase in friction between fibers. We have found that it is excellent in the above, and have completed the present invention.

That is, the invention made to solve the above problems is a strand used as a molding raw material for a 3D printer, which is a base material containing a thermoplastic resin as a main component and impregnated in the base material in the axial direction. A strand that includes one or more extending fibers or fiber bundles and is twisted along the axial direction.

Since the fibers or fiber bundles are impregnated in the base material and twisted, the strands are less likely to buckle and are excellent in handleability. In addition, due to the twisting, the modeled object formed by the 3D printer using the strand has excellent impact strength. Therefore, the strand makes it possible to easily form a modeled object having excellent impact strength with a 3D printer.

The number of twists per 1 m of axial length is preferably 10 times / m or more and 200 times / m or less.

As described above, when the number of twists is within the above range, the strand is less likely to buckle more reliably, and the handleability is improved. In addition, a modeled object formed by a 3D printer using the strand is more reliably excellent in impact strength.

The twist angle with respect to the axial direction is preferably 3 ° or more and 50 ° or less.

As described above, when the twist angle is within the above range, the strand is less likely to buckle more reliably, and the handleability is improved. In addition, a modeled object formed by a 3D printer using the strand is more reliably excellent in impact strength.

As the fiber or fiber bundle, carbon fiber or carbon bundle is preferable.

As described above, when the fiber or the fiber bundle is a carbon fiber or a carbon fiber bundle, the strand using the carbon fiber or the carbon fiber bundle, which is a relatively rigid type among the fiber materials, is less likely to buckle and is handled. Since it is excellent in properties, the superiority of the strand is further enhanced. In addition, by using the carbon fiber or the carbon fiber bundle having a relatively high strength among the fibers or the fiber bundle, the modeled product formed by the 3D printer using the strand has more excellent impact strength.

Another invention made to solve the above problems is a modeled product by a 3D printer, which is a substrate containing a thermoplastic resin as a main component and a substrate contained in the substrate, which is twisted along the axial direction. It is a modeled product including one or more fibers or fiber bundles.

The modeled object is excellent in impact strength because the fibers or fiber bundles are contained in the substrate and twisted.

Here, the "main component" means a component having the highest content, for example, a component having a content of 50% by mass or more.

As described above, according to the strand of the present invention, a modeled object having excellent impact strength can be easily modeled by a 3D printer. The modeled object of the present invention has excellent impact strength.

FIG. 1 is a schematic cross-sectional view schematically showing a cross section of a strand according to an embodiment of the present invention. FIG. 2 is a schematic perspective view showing a strand manufacturing apparatus of this embodiment.

Hereinafter, embodiments of the strand and the modeled object of the present invention will be described in detail. In this specification, one of the plurality of upper limit values described for any matter and one of the plurality of lower limit values can be appropriately combined. By combining in this way, it is assumed that the numerical range between the combined upper limit value and the lower limit value is described in the present specification as a suitable numerical range of any of the above items. Here, the numerical range between the upper limit value and the lower limit value described above includes a numerical range from the upper limit value to the lower limit value and a numerical range from the lower limit value to the upper limit value.

[First Embodiment]
First, the strand of the present embodiment will be described.

<Strand>
The strand is a strand used as a modeling raw material for a 3D printer, and is a base material containing a thermoplastic resin as a main component and one or a plurality of fibers impregnated in the base material and extending in the axial direction. Alternatively, it is provided with a fiber bundle and twisted along the axial direction. Hereinafter, fibers or fiber bundles are also collectively referred to as "fiber material". A base material impregnated with one or more fibers or fiber bundles is also referred to as a "composite".

For example, in the embodiment shown in FIG. 1, the strand 1 is impregnated with a base material 3 containing a thermoplastic resin as a main component and the base material 3, and is axially oriented in one direction (perpendicular to the paper surface of FIG. 1). A plurality of extending fiber materials 5 (three in FIG. 1) are provided, and twists are imparted along the axial direction. As described above, in addition to the embodiment in which the strand 1 includes a plurality of fiber materials 5, the embodiment in which the strand 1 includes one fiber material 5 may be adopted.

(3D printer)
The above-mentioned 3D printer adopts a heat-melting lamination method in which a three-dimensional shaped object is formed by gradually stacking the strands obtained by melting the thermoplastic resin component by heat. In this heat-melting lamination method, modeling is performed while adhering the previously formed layer and the next layer one by one in a semi-solid (softened) state. This 3D printer is not particularly limited as long as it can form a modeled object by gradually stacking resins in a state of being plasticized by heat. For example, a 3D printer includes a support plate that can be freely moved in the vertical, horizontal, and front-rear directions, and a supply unit that supplies the support plate while plasticizing the thermoplastic resin component of the strand.

(Base material)
The base material contains a thermoplastic resin as a main component. The base material can be impregnated with the fibers or fiber bundles in a molten state. Examples of the thermoplastic resin include polyolefin resins such as polypropylene and polyethylene, polyamide resins such as nylon, polyester resins such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), and polyimide resins such as polyethyleneimide (PEI). Examples thereof include resins, polyamide resins such as nylon, polycarbonate resins, polyether ether ketone (PEEK), polyacetal, and polyphenylene sulfide.

The lower limit of the content (impregnation amount) of the base material in the strand (100% by mass) is preferably 2% by mass, more preferably 5% by mass. If the content does not reach the lower limit, the impact strength of the strand may decrease. On the other hand, as the upper limit of the content, 98% by mass is preferable, and 95% by weight is more preferable. If the content exceeds the upper limit, the handleability of the strand may be deteriorated.

(Fiber or fiber bundle)
The strand comprises one or more fibers or fiber bundles. That is, the strand comprises one fiber, a plurality of fibers, one fiber bundle, or a plurality of fiber bundles.

The fibers are long fibers, that is, continuous fibers. The average length of the fibers is not particularly limited as long as it is 2 mm or more. The lower limit of the average length of the fibers is preferably 2 mm, more preferably 5 mm. On the other hand, the upper limit of the average length of the fibers is not particularly limited. The upper limit can be appropriately set to, for example, a length of 1000 m or 500 m.

The fiber bundle is formed by bundling a plurality of fibers into a continuous linear shape. The average length of the fiber bundle is not particularly limited as long as it is 2 mm or more. The lower limit of the average length of the fiber bundle is preferably 2 mm, more preferably 5 mm. On the other hand, the upper limit of the average length of the fibers is not particularly limited. The upper limit can be appropriately set to, for example, a length of 1000 m or 500 m.

The lower limit of the average diameter of the fibers is preferably 1 μm, more preferably 10 μm. If the thickness is less than the lower limit, it may be difficult to sufficiently increase the impact strength of the strand and the modeled object. On the other hand, the upper limit of the average diameter is preferably 30 mm, more preferably 10 mm. If the average diameter exceeds the upper limit, it becomes difficult to bend the strand, and it may be difficult to form a modeled object.

As the lower limit of the average thickness of the fiber bundle, 500 tex is preferable, 1000 tex is more preferable, and 5000 tex is further preferable. If the average thickness does not reach the lower limit, it may be difficult to sufficiently increase the impact strength of the strand and the modeled object. On the other hand, as the upper limit of the average thickness, 100,000 tex is preferable, 60,000 tex is more preferable, and 40,000 tex is further preferable. If the average thickness exceeds the upper limit, it becomes difficult to bend the strand, and it may be difficult to form a modeled object.

Examples of the fibers include carbon fibers, glass fibers, organic synthetic resins such as aramid, and metal fibers such as steel wire. As the fiber, carbon fiber is preferable. Examples of the fiber bundle include a carbon fiber bundle and a glass fiber bundle. As the fiber bundle, a carbon fiber bundle is preferable. Here, carbon fiber has relatively high strength among fiber materials. Therefore, since the fiber is a carbon fiber and the fiber bundle is a carbon fiber bundle, the strand is less likely to buckle and is excellent in handleability. Therefore, the superiority of the strand is further enhanced. In addition, by using carbon fibers or carbon fiber bundles having relatively high strength among the fibers, a modeled product formed by a 3D printer using the strands has more excellent impact strength.

(Torsion)
In the strand, the composite in which the base material is impregnated with the fiber material is twisted in the axial direction. The lower limit of the number of twists per 1 m of axial length is preferably 10 times / m, more preferably 20 times / m, further preferably 50 times / m, and particularly preferably 70 times / m. If the number of twists does not reach the lower limit, the strands tend to buckle, which may result in poor handleability. In addition, a model formed by a 3D printer using the strand may be inferior in impact strength. On the other hand, the upper limit of the number of twists is preferably 200 times / m, more preferably 150 times / m, and even more preferably 100 times / m. When the number of twists exceeds the above upper limit, the amount of the fiber material becomes relatively small compared to the amount of the resin material at the time of manufacturing the strand, and the modeled object formed by the 3D printer using the strand has impact strength. May be inferior to.

The twist angle with respect to the axial direction is determined by the average thickness and diameter of the fiber material and the number of twists. As the lower limit of the twist angle, for example, 3 ° is preferable, 10 ° is more preferable, and 15 ° is further preferable. If the twist angle does not reach the lower limit, the strand tends to buckle, which may result in poor handleability. In addition, a modeled object formed by a 3D printer using the strand may be inferior in impact strength. On the other hand, the upper limit of the twist angle is preferably 50 °, more preferably 35 °, and even more preferably 25 °. If the twist angle exceeds the upper limit, the amount of the fiber material becomes relatively small compared to the amount of the resin material, and the modeled object formed by the 3D printer using the strand may be inferior in impact strength. ..

In particular, when the strand includes a plurality of fibers or one or a plurality of fiber bundles, by imparting twist as described above, the thermoplastic resin component in the strand is more than the center side of the strand. Since a large amount can be distributed on the outer surface side, the impact strength of the modeled object can be further increased.

(Strand manufacturing method)
The method for producing a strand of the present embodiment includes a step of impregnating the melted base material with the fiber or the fiber bundle (impregnation step) and a step of bringing the impregnated fiber or the fiber bundle into a twisted state (a step of making the impregnated fiber or the fiber bundle twisted). It is equipped with a twisting process). The manufacturing method can be performed using, for example, the manufacturing apparatus 1 shown in FIG.

(manufacturing device)
As shown in FIG. 2, the manufacturing apparatus 1 kneads and melts a plurality of (three in FIG. 2) fiber material supply units 11 for feeding the coiled fiber material 5 at a predetermined speed and the base material 3. The extruder 25 and the resin bath portion 27 for impregnating the fiber material 5 sent out from the fiber material supply unit 11 with the base material 3 plasticized by the kneading extruder 25 are provided.

The manufacturing apparatus 10 is arranged on the downstream side of the resin bath portion 27 and is arranged on the downstream side of the cooling portion 31 and the cooling portion 31 for cooling the impregnated fiber material 5 sent out from the resin bath portion 27. The fiber material 5 before cooling is provided with a twisted portion 41 that imparts a twist around the center of the shaft.

The kneading extruder 25 is rotatably provided with a screw shaft (not shown) having kneading blades in a chamber 26 having a hollow inside, and melts and plasticizes the base material 3 charged from the hopper 23. ..

The resin bath portion 27 is formed in a cylindrical shape with the cylinder axis direction facing up and down, and the base material 3 plasticized by the kneading extruder 25 is supplied and stored inside the cylinder. The upper end of the resin bath portion 27 is open, and the fiber material 5 can be drawn into the base material 3 stored in the resin bath portion 27 from the upper end opening.

Although not shown, a plurality of (for example, four) impregnated rolls, which are rotatably held with their axes oriented in the horizontal direction, are parallel to each other and in the vertical direction inside the resin bath portion 27. It is provided at a predetermined or distance. The fiber material 5 introduced from the upper end opening of the resin bath portion 27 is sequentially spanned so as to meander these impregnated rolls from top to bottom. Twisting is imparted to the fiber material 5 at least on the downstream side of the lowermost impregnated roll among these plurality of impregnated rolls.

At the lower end of the resin bath 27, an outlet 28 for pulling out the impregnated fiber material 5 to the outside is provided. The outlet portion 28 is provided with a die 29 for shaping the base material 3 coated with the fiber material 5 to form a cross-sectional shape.

The cooling unit 31 is a long water tank along the direction in which the impregnated fiber material 5 is drawn out from the resin bath portion 27, and the cooling water 32 is stored in the tank. An inlet portion for introducing the impregnated fiber material 5 is provided on the tank wall closest to and opposed to the outlet portion 28 (die 29) of the resin bath portion 27, and the tank wall farthest from this inlet portion is provided. An outlet portion for discharging the impregnated fiber material 5 is provided. Therefore, in the cooling unit 31, the base material 3 in which the fiber material 5 is impregnated and coated can be cooled in the cooling water 32 and cured.

Various mechanisms or the like can be adopted as the twisted portion 41 arranged on the downstream side of the cooling portion 31. For example, as the twisted portion 41, although not shown, a mechanism for rotating the bobbin that winds up the strand 1 around the axis of the strand 1 may be adopted. On the other hand, as shown in FIG. 2, for example, as the twisted portion 41, a configuration having a pair of upper and lower take-up rolls 43 and take-up rolls 45 in which the outer peripheral surfaces of the twisted portions are in contact with each other may be adopted. The take-up roll 43 and the take-up roll 45 can rotate in different rotation directions so that the impregnated fiber material 5 sent out from the cooling unit 31 is sandwiched in a facing manner and can be sent out further to the downstream side.

That is, the pair of upper and lower take-up rolls 43 and take-up rolls 45 included in the twisted portion 41 draws the fiber material 5 from the fiber material supply portion 11 into the resin bath portion 27, and further draws the fiber material 5 from the resin bath portion 27 into the cooling portion 31 and the twisted portion. It also has a function of pulling out the fiber material 5 after impregnation into 41, and in the manufacturing apparatus 1, it constitutes a take-up portion for the fiber material 5 and the strand 1. A winding portion (not shown) may be separately provided on the downstream side of the twisted portion 41 so that the obtained strand 1 can be wound on a bobbin or the like.

The pair of upper and lower take-up rolls 43 and 45 are arranged so as to face an inclined direction with respect to the take-up direction of the impregnated fiber material 5, and both take-back rolls 43 and take-back rolls 45 are arranged with each other. Are oriented at equal angles to each other and in different directions. That is, the rotation axis of the upper take-up roll 45 and the rotation axis of the lower take-up roll 43 intersect with each other in a symmetrical X-shape centered on the take-back axis of the impregnated fiber material 5. ..

Next, an example of a method for manufacturing the strand 1 using the manufacturing apparatus 1 will be described.

(Immersion process)
The impregnation step is performed by the resin bath portion 27 of the manufacturing apparatus 1. Specifically, the base material 3 supplied from the hopper 23 is kneaded by the kneading extruder 25, and the base material 3 in the molten state is stored in the resin bath portion 27. The fiber material 5 is supplied from the fiber material supply unit 11 to the resin bath portion 27. In the resin bath portion 27, the base material 3 in the molten state is impregnated with the fiber material 5, and the impregnation amount is adjusted by passing through the die 29 arranged at the outlet portion 28. By this impregnation, the base material 3 is present in the gaps in each fiber material 5, around each fiber material 5, and between the fiber materials 5. The composite (fiber material after impregnation) of the base material 3 and the fiber material 5 thus obtained is cooled by the cooling unit 31.

(Twisting process)

In the twisting step, the twisting portion 41 imparts twist to the fiber material 5 in which the base material 3 is impregnated in the resin bath portion 27. Specifically, the impregnated fiber material 5 that has passed through the cooling portion 31 is passed through these nips while rotating the take-up roll 43 and the take-up roll 45 of the twisted portion 41. As a result, as described above, the fiber material 5 after impregnation (that is, in the impregnated state) is twisted at least on the downstream side of the lowermost impregnated roll (not shown) in the resin bath portion 27. By adjusting the inclination angle of the take-up roll 43 and the take-up roll 45 with respect to the take-up direction, the number of twists and the twist angle can be adjusted. By imparting the twist in this way, particularly when a plurality of fibers or one or a plurality of fiber bundles are used as the fiber material 5, the thermoplastic resin component in the strand 1 is outside the center side of the strand 1. Many can be distributed on the surface side.

In this way, the base material containing the thermoplastic resin is impregnated with the fiber material, and the strands twisted in the axial direction can be produced.

<Advantage>
Since the fibers or fiber bundles are impregnated in the base material and twisted, the strands are less likely to buckle and are excellent in handleability. In addition, due to the twisting, the modeled object formed by the 3D printer using the strand has excellent impact strength. Therefore, the strand makes it possible to easily model a modeled object having excellent impact strength with a 3D printer.

[Second Embodiment]
Next, the modeled object of this embodiment will be described.

The modeled object of the present embodiment is a modeled object by a 3D printer, and is a substrate containing a thermoplastic resin as a main component, and one or a plurality of substrates contained in the substrate and twisted along the axial direction. It includes a book fiber or a fiber bundle.

(3D printer)
Examples of the 3D printer in the modeled object of the present embodiment include the same 3D printer as the 3D printer in the strand of the first embodiment described above.

(Fiber or fiber bundle)
Examples of the one or more fibers or fiber bundles in the modeled object of the present embodiment include those similar to the one or more fibers or fiber bundles in the strand of the first embodiment described above. Further, as described above, the fibers or fiber bundles are also collectively referred to as "fiber material".

(Hypokeimenon)
The substrate contains a thermoplastic resin as a main component. The substrate can contain the fibers or fiber bundles in the substrate. Examples of the thermoplastic resin include the same ones as those of the thermoplastic resin of the first embodiment described above.

(Manufacturing method of modeled object)
A method for manufacturing a modeled object of the present embodiment includes, for example, a step of modeling with a 3D printer using the strand of the present embodiment described above as a modeling material. Specifically, it comprises a step of forming a modeled object by a fused deposition modeling method in which the strands of the present embodiment described above are used and the strands in a thermoplastic state by heat are stacked one by one by a 3D printer. In this model, the base material is melted, then cooled and solidified again to form the base material. In this substrate, there is a fiber material twisted as described above.

<Advantage>
As described above, the modeled product is excellent in impact strength because the fibers or fiber bundles are contained in a substrate containing a thermoplastic resin as a main component and twisted.

[Other Embodiments]
The present invention is not limited to the above embodiment.
For example, in the strand of the above embodiment, the twisted portion having the pair of take-up rolls described above imparts a twist to the composite impregnated with the molten thermoplastic resin. However, in addition, as a twisting addition, as described above, after impregnation, a winding portion (bobbin) configured to be twisted while winding the cooled composite can also be adopted. In this case, for example, the winding portion has a roll for winding the composite and a support member for supporting the roll, and the roll is perpendicular to the taking direction of the composite so that the roll winds the composite. It is possible to adopt an embodiment in which the support member is configured to rotate together with the roll around the second axis in the take-up direction while rotating with respect to the support member around one axis.

In FIG. 1 of the above embodiment, the base material is impregnated with a plurality of fibers, but in addition, the base material is impregnated with one fiber, and the base material is impregnated with one fiber bundle. It is also possible to adopt a mode in which the base material is impregnated and a mode in which a plurality of fiber bundles are impregnated in the base material.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

In order to examine the influence of the number of twists of the fiber material on the flexibility of the strand and the impact strength of the modeled object, Examples 1 to 4 and Comparative Example 1 shown below were prepared.

(Example 1)
As a fiber material, one 12000 tex carbon fiber bundle was used. Polypropylene was used as the thermoplastic resin as the substrate. The above-mentioned As shown in Table 1, the composite was twisted so that the twist angle was 5 ° and the number of twists per 1 m was 22 times / m. As a result, the strand of Example 1 was formed. The average diameter (outer diameter) of the obtained strands was 1.5 mm.

(Examples 2 to 4, Comparative Example 1)
Strands of Examples 2 to 4 and Comparative Example 1 were formed in the same manner as in Example 1 except that the inclination angle of the pair of take-up rolls with respect to the take-up direction was changed so as to have the twist angle and the number of twists shown in Table 1. bottom. The average diameter (outer diameter) of the strands of Examples 2 to 4 and Comparative Example 1 was 1.5 mm.

(Evaluation of wrapability (flexibility) around a cylinder)
When the obtained strands of Examples 1 to 4 and Comparative Example 1 were wound around cylinders having different diameters, the maximum diameter that could be wound without buckling was measured. The results are shown in Table 1. In Table 1, when the strands can be wound without bending at the time of winding, they are represented as "G" as good. When bending occurs during winding, it is expressed as "bending". In addition, when it was possible to wind it around a cylinder, it was expressed as "OK", and when it could not be wound around a paper tube, it was expressed as "impossible".

(Evaluation of impact resistance)
The obtained strands of Examples 2 to 4 and Comparative Example 1 were cut to a length of 100 mm, respectively, and used as a measurement sample. For each of Examples 2 to 4 and Comparative Example 1, a plurality of measurement samples are spread in a metal frame having an inner length of 100 mm, a width of 100 mm, and a thickness of 2 mm, and heat-pressed at 180 ° C. Obtained a model. This mimics the multi-layered nature of 3D printing. The fiber content of the obtained model was 50% by mass. This model was cut to a width of 10 mm and the Sharby impact test was measured. The results are shown in Table 1.

As shown in Table 1, by impregnating a base material containing a thermoplastic resin as a main component with a fiber material and imparting a twist, a strand that does not buckle and can form a modeled object having excellent impact strength can be obtained. It has been shown. When Comparative Example 1 is used, if the strands are cut and used as described above, the layers can be stacked to form a modeled object, but since the strands are inferior in flexibility, the layers are continuously stacked. It has been shown that it is difficult to model a modeled object.

As described above, the strand comprises a base material containing a thermoplastic resin as a main component and one or more fibers or fiber bundles impregnated in the base material and extending in the axial direction. Since the twist is applied along the axial direction, it becomes difficult to buckle and the handleability is excellent. In addition, due to the twisting, the modeled object formed by the 3D printer using the strand has excellent impact strength. Therefore, the strand makes it possible to easily model a modeled object having excellent impact strength with a 3D printer. The modeled product includes a substrate containing a thermoplastic resin as a main component and one or a plurality of fibers or fiber bundles contained in the substrate and twisted along the axial direction. Excellent impact strength. Therefore, by modeling a modeled object using the strands, it is possible to perform modeling that is expected to be increasingly required in the future to create a complex, delicate, and excellent impact strength modeled object with a 3D printer. It will be possible.

1 Strand 3 Base material 5 Fiber material (fiber or fiber bundle)
10 Manufacturing equipment 11 Fiber material supply part 23 Hopper 25 Extrusion kneader 26 Chamber 27 Resin bath part 28 Outlet part 29 Die 31 Cooling part 32 Cooling water 41 Twisting part 43, 45 Take-up roll

Claims (5)

A strand used as a raw material for modeling 3D printers.
A base material containing a thermoplastic resin as the main component and
The substrate is impregnated with one or more fibers or fiber bundles extending in the axial direction.
A strand that is twisted along the axial direction. The strand according to claim 1, wherein the number of twists per 1 m of axial length is 10 times / m or more and 200 times / m or less. The strand according to claim 1 or 2, wherein the twist angle with respect to the axial direction is 3 ° or more and 50 ° or less. The strand according to claim 1, claim 2 or claim 3, wherein the fiber or fiber bundle contains carbon fiber. It is a modeled object by a 3D printer,
A substrate containing a thermoplastic resin as the main component and
A modeled object including one or more fibers or fiber bundles contained in the substrate and twisted along the axial direction.

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